This set is the perfect system for an optimum room climate: the “Stella” valve actuator performs automatic adaptive hydronic balancing in underfloor heating systems. Sensors on the supply and return pipes measure temperature differences and an algorithm continuously calculates the required temperature spread and the corresponding valve position. The timelessly elegant room thermostats in the super-flat surface-mounted housing (only 13.9 mm deep) offer high control accuracy and adapt to any environment. And with the terminal strip from alre, temperature controllers and electrothermal valve actuators can be wired quickly, clearly and conveniently in the heating circuit manifold in conjunction with hot water underfloor heating systems. Stella can be used in combination with all standard temperature controllers and terminal strips. When using devices with a triac switching element, a dielectric strength (V DRM) of the triac of at least 800V is required. Contents: 6x valve actuator ZBOOA-010.185 5x surface-mounted thermostat RTBSB-201.000 1x terminal strip VOOPL-216.176